//
// Copyright (c) 2012, Tomoto S. Washio
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//   * Redistributions of source code must retain the above copyright
//     notice, this list of conditions and the following disclaimer.
//   * Redistributions in binary form must reproduce the above copyright
//     notice, this list of conditions and the following disclaimer in the
//     documentation and/or other materials provided with the distribution.
//   * Neither the name of the Tomoto S. Washio nor the names of his
//     contributors may be used to endorse or promote products derived from
//     this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL TOMOTO S. WASHIO BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
package com.tomoto.charset.native2ascii;

import static com.tomoto.charset.native2ascii.Native2AsciiCharsetUtils.ESCAPE_SEQUENCE_PREFIX;
import static com.tomoto.charset.native2ascii.Native2AsciiCharsetUtils.ISO_8859_1_CHARSET;
import static com.tomoto.charset.native2ascii.Native2AsciiCharsetUtils.ZERO_BYTE;

import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CoderResult;

public class Native2AsciiCharsetEncoder extends CharsetEncoder {

	protected Native2AsciiCharsetEncoder() {
		super(Native2AsciiCharsetUtils.N2A_CHARSET, 1, 6);
	}
	
	@Override
	public boolean isLegalReplacement(byte[] repl) {
		return true; // I don't care too much
	}

	@Override
	protected CoderResult encodeLoop(CharBuffer in, ByteBuffer out) {
		while (in.hasRemaining()) {
			char c = in.charAt(0); // lookahead
			if (c <= 0xff) {
				if (out.remaining() < 1) {
					return CoderResult.OVERFLOW;
				}
				out.put((byte) c);
			} else {
				if (out.remaining() < 6) {
					return CoderResult.OVERFLOW;
				}
				out.put(ESCAPE_SEQUENCE_PREFIX);
				if (c < 0x1000) out.put(ZERO_BYTE);
				if (c < 0x0100) out.put(ZERO_BYTE);
				// if (c < 0x0010) out.put(ZERO_BYTE); // not possible
				out.put(Integer.toHexString(c).getBytes(ISO_8859_1_CHARSET));
			}
			in.get(); // consume
		}
		
		return CoderResult.UNDERFLOW;
	}

}
